OFFSET
0,3
MAPLE
a := proc(n) option remember; local k; if n = 0 then 1 else
add(binomial(n, k) * pochhammer(1/4, k) * 4^k * a(n - k), k = 1..n) fi end:
seq(a(n), n = 0..19);
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Luschny, Mar 08 2024
STATUS
approved